I've got 3 WinXPs and 2 Win98s in my household. The Win98s can access shared folders on 2 of the WinXPs as guest. but not WinXP #3. When the Win98s try to access WinXP #p ( \\Falcon ) they get this error: " You must supply a password to make this connection. Resource \\falcon\IPC$"
I've spent several hours trying options and comparing WinXPs to no effect. Guest account in enabled on #3 (Falcon) and #3 can access the Win98s.
All of these machines are inside a Linksys router. They can all picg each other (Even the Win98s can Ping WinXP #3) and that can all access the internet. The Win98s can share folders on the other WinXPs without issue.